Agriculture Reference
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a
b
c
d
e
f
Fig. 4.2. Responses of two-shoot peas to overall and to localized stress conditions. a Both
shoots developed in most control plants in optimal conditions. b Removing a large part of
the cotyledons, and hence of the reserve materials, increased shoot inequality. c Growing
plants in vermiculite without nutrient solutions ( NS ) increased shoot inequality. d Shading
both shoots, which presumably limited photosynthesis, is a third example of the general
increase of shoot inequality in response to stress. e , f Restricting the light reaching only one
of two young shoots greatly limited its development. When a shoot was darkened ( f )rather
then shaded ( e ) it died in 80% of the plants. The numbers refer to the dry weights of the
shoots in milligrams. (They are not comparable to the fresh weights in Fig. 4.1.); (Based on
Sachs and Novoplansky 1997 and Novoplansky et al. 1989)
 
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